If you are running a Solid State Drive in your computer, you should turn off the automatic defragment option in Windows.  SSDs are not affected by file fragmentation in the same way as traditional hard drives are and don’t need to be defragged.  Actually, it shortens their lifespan.  After purging a bunch of data from your SSD, you should restart your system and just let it sit idle for a while.  It will optimize itself.